/*
* Copyright (c) 2010 SimpleServer authors (see CONTRIBUTORS)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package simpleserver.config.xml;
import java.io.IOException;
import java.lang.reflect.Modifier;
import java.util.HashMap;
import java.util.Set;
import java.util.Stack;
import org.reflections.Reflections;
import org.reflections.scanners.SubTypesScanner;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.helpers.DefaultHandler;
class XMLTagResolver extends DefaultHandler {
private HashMap<String, XMLTag> tags = new HashMap<String, XMLTag>();
private Stack<XMLTag> stack = new Stack<XMLTag>();
private Config root;
XMLTagResolver() throws SAXException {
loadTags();
}
Config root() {
return root;
}
@Override
public void startElement(String uri, String name, String qName, Attributes atts) throws SAXException {
XMLTag tag;
try {
tag = getTag(qName);
} catch (SAXException e) {
if (root != null && stack.peek().acceptChildAttribute(qName)) {
tag = new AttributeElement(qName);
} else {
throw e;
}
}
if (root == null) {
root = (Config) tag;
}
stack.push(tag);
tag.setAttributes(atts);
}
@Override
public void endElement(String uri, String name, String qName) throws SAXException {
XMLTag tag = stack.pop();
tag.finish();
tag.clean();
if (tag instanceof AttributeElement) {
stack.peek().setAttribute(((AttributeElement) tag).name, ((AttributeElement) tag).value);
} else if (!stack.isEmpty()) {
stack.peek().addChild(tag);
}
}
@Override
public void characters(char[] chars, int start, int length) throws SAXException {
stack.peek().content(new String(chars, start, length));
}
@Override
public InputSource resolveEntity(String name, String publicId) throws SAXException, IOException {
return new InputSource(getClass().getResourceAsStream("config.dtd"));
}
@Override
public void warning(SAXParseException exception) throws SAXException {
System.out.println("warning:");
exception.printStackTrace();
}
@Override
public void error(SAXParseException exception) throws SAXException {
throw exception;
}
private XMLTag getTag(String tagName) throws SAXException {
if (!tags.containsKey(tagName)) {
throw new SAXException(String.format("Found unknown tag \"%s\"", tagName));
}
try {
return tags.get(tagName).clone();
} catch (CloneNotSupportedException e) {
throw new SAXException(String.format("Unabled to load tag \"%s\"", tagName));
}
}
private void loadTags() throws SAXException {
Reflections r = new Reflections("simpleserver", new SubTypesScanner());
Set<Class<? extends XMLTag>> classes = r.getSubTypesOf(XMLTag.class);
for (Class<? extends XMLTag> tag : classes) {
if (Modifier.isAbstract(tag.getModifiers())) {
continue;
}
XMLTag instance;
try {
instance = tag.getDeclaredConstructor().newInstance();
} catch (Exception e) {
throw new SAXException("Unable to load tag \"" + tag.getSimpleName() + "\" (after " + tags.size() + " tags)");
}
tags.put(instance.tag, instance);
}
}
private static class AttributeElement extends XMLTag {
String name;
String value;
AttributeElement() {
super(null);
}
AttributeElement(String name) {
this();
this.name = name;
}
@Override
void content(String content) {
if (value == null) {
value = content;
} else {
value += content;
}
}
}
}